radio notifications and sd_flash_*()

Question

Hi, 
 I have an application where both radio notifications and flash operations are used. 
 It seems that every sd_flash_write() generates two radio notifications. So during startup of my application there is a burst of radio notifications although there is actually no radio operation. Even advertising is still off. 
 Is my observation correct? And how can this be prevented from happening? 
 Thanks, Hardy

rgrr2 · Accepted Answer

Ok... answering my own question: this (mis)behavior is document in the softdevice release notes (search for "flash"). So this is a known issue. @nordic: because this is really a longstanding thing, why don't you document this in the description of the radio notifications? 
 Bad luck anyway. 
 Somewhere in this forum it has been mentioned, that using the timeslot API may help.
Also someone seems to have used PPI to catch radio events. 
 Best for me would be a portable solution for nRF51, nRF52, S110/v6(?) and S132/v2. 
 Any ideas/suggestions? 
 Hardy 
 PS: my actual intention is to calculate power consumption of the radio. Perhaps there is a better/easier way than couting "radio on" times!?

rgrr2 · Answer

here: ble_radio_notification_evt_handler_t
or
here: ble_radio_notification_init()

radio notifications and sd_flash_*()

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